channel activity has inconsistent between metadata and description

[masterclock]

contrib/activity/channel/descriptor.json

Line 16 in 9d5e983

"name": "value",

name is "value", but

contrib/activity/channel/metadata.go

Line 9 in 9d5e983

Data interface{} `md:"data"` //The data to put on the channel

name is "data"

[skothari-tibco]

Thanks for bringing that to our attention.